Re: PCMCIA support for 860 -- lost interrupt

Damm wrote:

Shuangjun Zhu wrote:

quoted

1. what board are you trying to use pcmcia with?

I'm using a MPC823 FADS board and PCMCIA for ATA/IDE,

2. check and see that m8xx_pcmcia gets your MHz or Hz value correct.
  The MHz/Hz value is used by my driver to calculate the number of
  waitstates necessary for all pcmcia accesses. So, if that is bad
  much stuff will get wierd.

I have set the M8XX_BUSFREQ as following in m8xx_pcmcia.c,
BTW, my MPC823 runs' frequency is 48MHZ, which pcmcia uses the SLOT_B.

#ifdef CONFIG_BD_IS_MHZ
#define M8XX_BUSFREQ (48 * 1000000)
#else
#define M8XX_BUSFREQ (48)
#endif

quoted

1. why "lost interrupt"? irq for IDE is 9, PCMCIA_INTERRUPT=13,
   so, which hardware trigger IRQ 9?

Well, you have to figure out that one for yourself.
I have no idea. Maybe the MHz/Hz stuff above could help you.
Check proc/interrupts...

The m8xx_pcmcia driver handles 1 (one) interrupt.
That interrupt is the status changed interrupt and it tells
us if someone has inserted/removed a card and some other stuff.

Then - the pcmcia package will figure out what other interrupt
the device driver for the card you've inserted (ide, serial, etc)
will use. And then that (ide) code will request that irq and use
is as if it was any other interrupt. That is the second interrupt.

From the code ide_cs.c in pcmcia package, the m8xx_pcmcia interrupt

handler will call the ide_event() in ide_cs.c, this function does
nothing with ide interrupt handler in the kernel.

Here is Dan's ideas

See, this is why I changed the function name in the first place.
request_irq() assumes a PC-like interrupt structure, which doesn't work
on the MPC8xx internal interrupt controller.  You need to add an
indirect function call to the 'md' structure that will install the
IDE interrupt handler.  When you use the PCMCIA for ATA/IDE, you should
call a function that installs the PCMCIA interrupt vector.

In drivers/block/ide-probe.c,
init_irq() function has installed the IDE interrupt handler of IRQ 9 as
ide_intr()
In m8xx_pcmcia.c from the pcmcia package, Damm has installed the PCMCIA
interrupt
IRQ 13 as m8xx_interrupt(), so problem is:
without 8259 controller in FADS board, how the m8xx_interrupt() route the
interrupt
event to the ide_intr(). No hardware triger the IRQ 9, no call ide_intr(),
so the
kernel think "lost interrupt", I guess.


BRs,
Shuangjun


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